<!doctype html>
<html>

<head>
    <title>Line Chart</title>
    <script src="../dist/Chart.bundle.js"></script>
    <script src="http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
    <style>
    canvas {
        -moz-user-select: none;
        -webkit-user-select: none;
        -ms-user-select: none;
    }
    </style>
</head>

<body>
    <div style="width:75%;">
        <canvas id="canvas"></canvas>
    </div>
    <button id="randomizeData">Randomize Data</button>
    <button id="addDataset">Add Dataset</button>
    <button id="removeDataset">Remove Dataset</button>
    <button id="addData">Add Data</button>
    <button id="removeData">Remove Data</button>
    <script>
    var MONTHS = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];

    var randomScalingFactor = function() {
        return Math.ceil(Math.random() * 10.0) * Math.pow(10, Math.ceil(Math.random() * 5));
    };
    var randomColorFactor = function() {
        return Math.round(Math.random() * 255);
    };
    var randomColor = function(opacity) {
        return 'rgba(' + randomColorFactor() + ',' + randomColorFactor() + ',' + randomColorFactor() + ',' + (opacity || '.3') + ')';
    };

    var config = {
        type: 'line',
        data: {
            labels: ["January", "February", "March", "April", "May", "June", "July"],
            datasets: [{
                label: "My First dataset",
                data: [randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor()],
                fill: false,
                borderDash: [5, 5],
            }, {
                label: "My Second dataset",
                data: [randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor(), randomScalingFactor()],
            }]
        },
        options: {
            responsive: true,
            title:{
                display:true,
                text:'Chart.js Line Chart - Logarithmic'
            },
            scales: {
                xAxes: [{
                    display: true,
                    scaleLabel: {
                        display: true,
                        labelString: 'x axis'
                    }
                }],
                yAxes: [{
                    display: true,
                    type: 'logarithmic',
                    scaleLabel: {
                        display: true,
                        labelString: 'y axis'
                    }
                }]
            }
        }
    };

    $.each(config.data.datasets, function(i, dataset) {
        dataset.borderColor = randomColor(0.4);
        dataset.backgroundColor = randomColor(0.5);
        dataset.pointBorderColor = randomColor(0.7);
        dataset.pointBackgroundColor = randomColor(0.5);
        dataset.pointBorderWidth = 1;
    });

    window.onload = function() {
        var ctx = document.getElementById("canvas").getContext("2d");
        window.myLine = new Chart(ctx, config);
    };

    $('#randomizeData').click(function() {
        $.each(config.data.datasets, function(i, dataset) {
            dataset.data = dataset.data.map(function() {
                return randomScalingFactor();
            });

        });

        window.myLine.update();
    });

    $('#addDataset').click(function() {
        var newDataset = {
            label: 'Dataset ' + config.data.datasets.length,
            borderColor: randomColor(0.4),
            backgroundColor: randomColor(0.5),
            pointBorderColor: randomColor(0.7),
            pointBackgroundColor: randomColor(0.5),
            pointBorderWidth: 1,
            data: [],
        };

        for (var index = 0; index < config.data.labels.length; ++index) {
            newDataset.data.push(randomScalingFactor());
        }

        config.data.datasets.push(newDataset);
        window.myLine.update();
    });

    $('#addData').click(function() {
        if (config.data.datasets.length > 0) {
            var month = MONTHS[config.data.labels.length % MONTHS.length];
            config.data.labels.push(month);

            for (var index = 0; index < config.data.datasets.length; ++index) {
                config.data.datasets[index].data.push(randomScalingFactor());
            }

            window.myLine.update();
        }
    });

    $('#removeDataset').click(function() {
        config.data.datasets.splice(0, 1);
        window.myLine.update();
    });

    $('#removeData').click(function() {
        config.data.labels.splice(-1, 1); // remove the label first

        config.data.datasets.forEach(function(dataset, datasetIndex) {
            dataset.data.pop();
        });

        window.myLine.update();
    });
    </script>
</body>

</html>
